qs:qserialize() zstd compression error

[billdenney]

While running SCM in the documentation example, there is an error:

  Error in qs::qserialize(ui) : zstd compression error
  [1] "error fitting the model for the covariate "
  <simpleError: zstd compression error>

https://github.com/nlmixr2/nlmixr2extra/actions/runs/3852288938/jobs/6564288954#step:6:2350

It appears to occur here:

nlmixr2extra/R/SCM.R

Lines 72 to 74 in c13dc98

	#' auto2 <- covarSearchAuto(fit, varsVec = c("ka", "cl"), covarsVec = c("WT"),
	#' catvarsVec= c("SEX"), restart = TRUE)
	#'

I cannot replicate this locally, but it seems to happen repeatably in CI. My current guess is that this is (part of) the CI issue that I'm trying to work through in #30.